Created by Luisa Pereira, The Well–Sequenced Synthesizer is a series of sequencers -- physical interfaces to play with musical rules. It consists of The Counterpointer, a cross between an electronic arpeggiator and a baroque music rule book, El Ordenador that carves chaos into order by applying constraints to randomly generated chord progressions and finally La Mecánica which uses a traditional music box mechanism to play back the progressions generated by El Ordenador.